Pressure-filter.



C. W.MERRILL.

PRESSURE FILTER.

APPLICATION FILED JUN?J 3, 1905. RENBWBD JULY 29, 1908.

Patented Oct. 6, 1908.

2 SHEETS-SHEET 1.

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By /15 Affofney,

'0. W. MERRILL.

PRESSURE FILTER.

APPLIOATIo-N FILED JUNE 3, 1905. BENBWBD JULY 2o, 190s.

Patented 0st. 6, 1908. ta"SVHE'.E'I.S-SHLET 2.

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elevation, partly in cross-section,

v separation UNITED sTAfrE-s PATENT orales.

CHARLES W. ,MERRILL OF LEAD, SOUTH DAKOTA.v

l Panama-Huma.

No. ooo,1s4.

Appiibation mea :une s, 1905,

To au whom it may 'con/cem:

Be it known that I, CHARLES W. Masami., a citizen of the United States, and resident of Lead, Lawrence county, vState of South Dakota, have invented certain new and use ful Improvements in Pressure' Filters, of whiehthe followin is a specification.

My inventionre ates to improvements in aratus for separating/ unfilterable matei'i from a. mixture of filterable and unfilterable matter, and-it particularly relates to in1 proveinents in pressure' filters in which the of such materials is effected and specificaties of Letters Patent.

in which thc\unfilterable matter is subsequently subjected to metallurgical treatnient. g'

The object of' my invention is to provide devices for maintaining a comparatively thick la er of recipitant and. the clotiis of t e filter plates t rough which the solution has `topass, infiltcr presses which are composed ofa series of containers and filter plates, and particularly presses .in which containers and filter plates are employed, the the bottom inlet, and the object of maintaining such comparatively thick layer is to insure practical y a molecular contact between the precipitant and the solution to be precipitated, thereby effecting much more thorough precipitation.l

A further object is to provide devices which will prevent the material in the containers from settling back-into the channels' of the press when the latter is not in use. This I accomplish by means ofa continuous valve arrangement for closing all inlets. The invention will be best understood by reference tothe accompanying two sheets of drawings, in which Fi ure 1 is an elevation partly in section, of a ilter press of the type aforesaid; Fi 2 shows the container of the press change( to embody the present invention; Fig. 3 shows a vertical section of the present invention, on the line P, P of Fig. 2, looking in the direction of the arrows, and Fig. 4 shows a partial perspective of a part of the invention on the ine Q Q of Fi 2, looking in the direction of the arrows; 5 is an enlar ed sectional view of'the container plates an grillesshowing the filter cloths in place; Fig. 6 shows an of a press provided with s. continuous valve arrangen'icnt for closing all inlets to the containers if the press is not in use; Figs. 7 and aro cnrecipitate on sides of which converge toward' Patented Oct. 6, 1908.

semi n. 263,511. ammi Juiy 29, 190s. seria No. 445,925.

larged detailed views of parts of the mechanism shown in Fig. 6.

Similar letters refer to similar parts throu hout the views. y

ln ig. 1 of the drawings, s represents the standards at either end of the press, h the frame of the press, j is the screwwhich forcestlre end t forward on the frame by means of the handle i, x :c are the exterior frames of the series of containers, g g are the filter plates, c c the inlet pipes. All of these devices and parts, are common to the ordinary form of filter press.

e e are lugs upon which the containers and filter plates are supported u on the frame h; d is an inlet through which t e liquids, va ors or gas may be introduced behind the ter cloths; o is an opening or inlet at tlie bottoni, through which the solid, semi-solid or unlterable material (hereinafter for convenience called the preci itant") is introduced into the containers t rough the port 16.

When a series of containers is pu-t together in A a'filter press, the opening ogmakes a continuous opening through the press which is closed at the ends in any convenient manner. 8 S are the outlets in each of the filter plates, which are provided for the eiuent liquids, vapors or gases, and in the form of open delivery show n in Fig. 1 ,they terminate in each case in the stop cocks 10 which 'dis charge into a trough of suitable dimensions. r In Fig. 2, x represents the container, the sides of which are made converging as shown. Into this is inserted a grille 12, which is set in the frame .11, which rests in a recess or depression in the outer vertical face of thecontainer x, as shown in Fig. 3. grating is composed of a series of sheet metal stri of a width equal to the thickness of the gril e. The grille corresponds in shape tothe shape of the container and the filter plate and is fitted tightly into the recess on the edge of the container. The filter cloths 13, or other filtering media shown in Fig. 5, are placed between the surface of the filter plate andthe face of the grille and in this way spaces are formed in front of the filter clot on each side of the container, in which the precipitant collects and is held. -As a result thereof, the solution to be precipitated must pass throughV a thicker layer of' lprecipitant than could hc otherwise formo( upon the,

surface of tho cloths provided the grille was lnot there, thus promoting the efiiclency of tho I nccipitatlon.

The4 grille or A In Figs. 5, 6 and 7`-, o represents theri'let 4 and llquid isvint'roduced,

through which the mixture -of precipitant and ,which is provided, as shown inA these figures, with" an interior pipe 14, capable of being rotated with- A in the press, Whlch pi e extends the entire length of the ress. Tlie containers are each provided wit an opening` 16, and opposite I I- 'each such' opening in the pipe 14. is a corre- A plates 9 9 are covered with or close the `o'peni spending opening 15. The effect of rotating the pipe 14 in the opening o would be to openl 16 as shown in these views. The shape o 4 the container may v ary froni time to time, provided however that in all cases the sides converge toward the bottom in themanner shown.

The method of operation is as follows: The material to be filtered, cosistin of a li uid, gas or 'vapor and the ser'nirs'oli or un terable material for convenience called the prel cpitant, is brought into the container x through the bottom inlet vchannel O. The filtering material,

Which-completes the closure of the filtersl so far as. the unfilterable cerned, while the liquid,l` gas or vapor passl tant and been'corn leted, the containers are then 5f) material is conthrough the filtering 4medium and lout through the grooves in the filter plate. The

' effect of the employment of the grllles or giratlngs 11, so placed in the containers as to leave a space between the interior of the`containereand the'cloths of the filter plates, is to maintainat all times a 'comparativelythick la er of precipitate upon the cloths through.

w ich the solution is to. ass. The clarified liquid passes out from. t elter plate 9 by means ofthe opening 8, either into a continuous channel within the press, or ythrough openings'closed byxsuitable stop cocks 'into a rtrough 1n the case of a open discharge.' The unfilterable contents of the containers is deposited upon the leached or'treated ifdesired while in place, by forcing liquid vor gas through it, .when vapor or gas may be then introduced by `means ofl inlet d which connects with the plate. When the desired treatment of the precipif precipitate 4in the containers has o ed an are cleanedu b hand and new nre 'then inserted an v.the outlets are v I egqiisfi 1 the use ofl t l(if each port of all the containers plates 9l and may be then closed and the ressure filter is'again."r eady for char shen it is desired to suspend e press or prevent the material in the containers from settling back into the feed channel, the pipe 15 is rotated, and the ports 16 are closed until such press is to be used again.

VI claim as my invention:

1. Inv a pressure filter, the combination A with a container, of a grille or gratin l placed on either side thereof entirely wit ,saine and in such position that when the container is put together with the filter plates in a filter press, said grille will retain a layer of unfilterable matter or precipitate.

`2'. In. a ressure filter a sexies of containers, the si es of which convergetoward the bottom substantially as set forth, each having an opening inthe bottom 'angle forming a continuous channel entirely within thepress When the contalners are putv together,

and an opening which opens directly upward4 from said channel into the interior, anddei vices substantially as described AWhereb'.` the openings into the containers may be c osed -atwilL f B ln a pressure filter the combination with the feed channel, of a rotative pipe placed therein, rovided with ajseries of orts, `each one of W ich corresponds witli-'anlicomes opposite to the inlet port of each container, whereby by the rotation' of .the pi e, closure, -of-each port of all the containers 1s effected. 

